Speed-indicator.



N0. 888,798. PATENTED MAY 26, 1908.

E. T. GREENFIELD.

7 SPEED INDICATOR. APPLICATION FILED H218, 1907.

(CE EL (QKKE L.

UNITED. STATES PATENT oFFioE.

EDWIN T. GREENFIELROFKIAMESHA, NEW YORK.

SPEED-INDICATOR.

Specification of Letters Patent.

. Patented my 26, 1908.

Application filed February 8, 1907. Serial No. 356,382.-

To all whom it may concern:

,Be it known that I, EDWIN T GREEN- FIELD, a citizen of the United States, resid-- ing at Kiamesha, in the county of Sullivan.

of a device connected to a rotating shaft and carries a brush adapted to move over contacts arranged in line. The solenoidal coil is of arc sha e and consists of a plurality of coil sections; 1ts core is also arc-shaped and has secured thereto a pivoted indicator, the pivot being the center about which the arcshaped core and .coil are curved. The centrifugal governor is preferably arranged to out lnto the circuit of a battery or other source of supply of electric energy one or more of the sections of the coil and the num ber of such sections having current passing therethrough determines the position of the core andindicator.

.The referred embodiment of the invention is i lustrated in the accompanying drawries a weight b.

ing which is a diagrammatic view of the several parts and the electrical connections beat one end to one of the arms I), I) an at the other to a frame C adapted to slide axially on shaft B. This frame carries a brush 0 ada ted to slide over and make contact with a p udrawing, A indicatesthe .first contact 0.

the first coil-section rality of contacts 0" arranged in line as the frame Cmoves on shaftB. Brush '0 is connected to one terminal of a battery D by a wire d, as by connecting wire d to a bearing for shaft B.

The indicating instrument consists of a base E on which is pivotally mounted an index e, one end of which moves over'a scale e and the other end of which has secured thereto an arc-shaped core 6 curved about the pivot of the index as a center and adapted to enter more or less into a coil F similarly curved. Coil F consists of a plurality of sections f, seven such sections being here shown though the number may be varied as desired. One side of the first coil-section is connected by wire f to the battery D; theother side of this section is connected to the next.

section as tions.

Thefirst of ,the contacts 0, that is, the lowest one, is connected by wire 1 to the connection between the first and second coilsections f, the second by wire 2 to the connection between the second and third coilsections, the third by wire 3 to the connection between the third and fourth sections and so on, the last one being connected by wire 7 to the end of the last coil-section. The movable element of the indicating instrument including the core e and index 1; may be so constructed as to come to a balance with the index in the zero position. I

The operation of the device as thus constructed will now be described.

When shaft A is at rest, shaft B is also at rest and weights 6 frame C and brushc drop by gravity to their lowest positions, brush 0 are all the other adjacent coil-secbeingthen out of contact with thecontact;v

studs 0, and the circuit of batteryD is open. Asshaft- A begins to rotate, shaft'B rotates with it and the weights 6 move up carrying frame C with them in proportion to the speed of shafts A and B until brush 0 engages the The circuit of battery D is then closed through the first of the coil-sections and the latter, becoming energized,

acts on core e to move it to a position in which it is centrally disposed with respect to The indicator is thus moved over the sea e e-to a position corresponding to the speed of shaft A when brush 0 is on the first contact 0. shaft A is increased, ,the frame C and rush 0 next contact a and the circuit of the battery If the s eed of are moved up until the brush bears on the coil-sections f in series.

net/1O flux of the'two sections then acts upon is'then-closed through the first and second The combinedmagcome so that the latter'is drawn further into the coil F, the core coming to rest when it is centrally disposed with respect to the field of force of these two coil-sections acting together. of the coil sections are cut into circuit in series and the center of the magnetic field is Similarly as brush is raised, more shifted as each additional section is cut in,

' tion of the coreand index.

factured at small cost particularly as no flexible shafting is required running from i an axle of the vehicle to the dash-board and current to actuate the indicator.

as a single coil of drybatteryfurnishes ample 'By increasing the number of coil-sectionsdj and contacts 0 the increments of speed in icated by the V instrument may be reduced but in most cases I have found it sufficient if the number of sections and contacts be such that lncrements of five miles per hour-are shown by the instrument.

Having described my invention what I claim as new therein and desire to secure by Letters Patent of the United States, is:

1. A speed indicator comprising the combination of a rotary shaft, a centrifugal governor driven thereby, a coil consisting of a plurality of coil sections, a source of supply of electric energy, a circuit-controlling device, wires leadin therefrom to said coil sections, sa1d devicebe'ing actuated by sa1d governor to connect varying numbers of said coil sections in circuit with said source of supply,

a core for said coil, an indicator connected to said core and actuated thereby, and a scale with which said indicator cooperates, substantially as setforth.

' 2. A speed indicator comprising the combination of a rotary shaft, a centrifugal governor driven thereby, a. coil consisting of a plurality of coil sections, a source of supply of electric energy, a circuit-control1ing device wires leadin therefrom to said coil sections, said devicebeing actuated by said governor to connect one or more of said coil sections in series in circuit with said source of supply, a core for said coil, an indicator connected to said core and actuated thereby, and a scale with which said indicator cooperates, substantially as set forth.

3. A speed indicator comprising the combination of a rotary shaft, a centrifugal governor driven thereby, an arc-shaped coil consisting of aplurality of coil sections, a source of supply of electric energy, a circuit-controlling device, Wires leading therefrom to said coil sections, said device being actuated by said governor to connect varying numbers of said coil sections in circuit with said source of supply, an arc-shaped core for said coil, a pivoted indicator connected to said core and actuated thereby, and a scale with which said indicator cooperates, substantiallyas set forth.

4. A speed indicator comprising the combination-offa rotary shaft, a centrifugal governor driven thereby, a coil consisting of a plurality of coil sections, a source of supply of electric energy, a circuit-controlling de vice, wires leadiri therefrom to said coil sec? tions, said device eing actuated by said governor to connect the end section of said coil in circuit with said source of supply or to connect one or more sections adjacent thereto in series with said end section in said circuit, a core for said coil, an indicator connected with sa1d core, and a scale over which sa1d indicator moves, substantially as set forth.

5. A speed indicator comprising the coin binatlon of a rotary shaft, a centrifugal governor driven thereby, a coil consisting of a plurality of coil sections, a source of supply of electric energy, a circuit-controlling device, Wires leadin therefrom to said coil sections, said device eing actuated by said gov ernor to connect a progressively increasing number of said coil sections adjacent to one end of the coil in series in circuit with said source of supply as the speed of said centrifugal governor increases, a core for said" coil, an lndlCHdJOTSLClJIlfiU-Bd by sa1d core, and a scale over which the indicator moves, substan-.

tially as set forth. 6. A speed indicator comprising the combination ofa rotary shaft, a centrifugal gov-- ernor driven thereby, an arc-shaped coil consisting of a plurality of coil sections, a source of supply of electric energy, a circuit-control ling device, wires leading therefrom to said coil sections, saiddevice being actuated by EDWIN T. GREENFIELD.

Witnesses:

E. A. PERRY, RUBY LAss TER. 

